/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
let extractComponentStyle, getRgb, loopArray, getStyleSheetById

const _css = `
.weex-refresh-indicator,
.weex-loading-indicator {
  width: 1rem !important;
  height: 1rem !important;
  -webkit-box-align: center;
  -moz-box-align: center;
  -webkit-align-items: center;
  -ms-flex-align: center;
  align-items: center;
  -webkit-box-pack: center;
  -moz-box-pack: center;
  -webkit-justify-content: center;
  -ms-flex-pack: center;
  justify-content: center;
  overflow: visible;
  background: none;
}
.weex-refresh-indicator:before,
.weex-loading-indicator:before {
  display: block;
  content: '';
  font-size: 0.16rem;
  width: 0.5em;
  height: 0.5em;
  left: 0;
  top: 0;
  border-radius: 50%;
  position: relative;
  text-indent: -9999em;
  -webkit-animation: weex-spinner 1.1s infinite ease;
  -moz-animation: weex-spinner 1.1s infinite ease;
  animation: weex-spinner 1.1s infinite ease;
}

@-webkit-keyframes weex-spinner {
  0%,
  100% {
    box-shadow: 0em -1.3em 0em 0em #ffffff, 0.9em -0.9em 0 0em rgba(255, 255, 255, 0.2), 1.25em 0em 0 0em rgba(255, 255, 255, 0.2), 0.875em 0.875em 0 0em rgba(255, 255, 255, 0.2), 0em 1.25em 0 0em rgba(255, 255, 255, 0.2), -0.9em 0.9em 0 0em rgba(255, 255, 255, 0.2), -1.3em 0em 0 0em rgba(255, 255, 255, 0.5), -0.9em -0.9em 0 0em rgba(255, 255, 255, 0.7);
  }
  11.25% {
    box-shadow: 0em -1.3em 0em 0em rgba(255, 255, 255, 0.7), 0.9em -0.9em 0 0em #ffffff, 1.25em 0em 0 0em rgba(255, 255, 255, 0.2), 0.875em 0.875em 0 0em rgba(255, 255, 255, 0.2), 0em 1.25em 0 0em rgba(255, 255, 255, 0.2), -0.9em 0.9em 0 0em rgba(255, 255, 255, 0.2), -1.3em 0em 0 0em rgba(255, 255, 255, 0.2), -0.9em -0.9em 0 0em rgba(255, 255, 255, 0.5);
  }
  25% {
    box-shadow: 0em -1.3em 0em 0em rgba(255, 255, 255, 0.5), 0.9em -0.9em 0 0em rgba(255, 255, 255, 0.7), 1.25em 0em 0 0em #ffffff, 0.875em 0.875em 0 0em rgba(255, 255, 255, 0.2), 0em 1.25em 0 0em rgba(255, 255, 255, 0.2), -0.9em 0.9em 0 0em rgba(255, 255, 255, 0.2), -1.3em 0em 0 0em rgba(255, 255, 255, 0.2), -0.9em -0.9em 0 0em rgba(255, 255, 255, 0.2);
  }
  37.5% {
    box-shadow: 0em -1.3em 0em 0em rgba(255, 255, 255, 0.2), 0.9em -0.9em 0 0em rgba(255, 255, 255, 0.5), 1.25em 0em 0 0em rgba(255, 255, 255, 0.7), 0.875em 0.875em 0 0em #ffffff, 0em 1.25em 0 0em rgba(255, 255, 255, 0.2), -0.9em 0.9em 0 0em rgba(255, 255, 255, 0.2), -1.3em 0em 0 0em rgba(255, 255, 255, 0.2), -0.9em -0.9em 0 0em rgba(255, 255, 255, 0.2);
  }
  50% {
    box-shadow: 0em -1.3em 0em 0em rgba(255, 255, 255, 0.2), 0.9em -0.9em 0 0em rgba(255, 255, 255, 0.2), 1.25em 0em 0 0em rgba(255, 255, 255, 0.5), 0.875em 0.875em 0 0em rgba(255, 255, 255, 0.7), 0em 1.25em 0 0em #ffffff, -0.9em 0.9em 0 0em rgba(255, 255, 255, 0.2), -1.3em 0em 0 0em rgba(255, 255, 255, 0.2), -0.9em -0.9em 0 0em rgba(255, 255, 255, 0.2);
  }
  61.25% {
    box-shadow: 0em -1.3em 0em 0em rgba(255, 255, 255, 0.2), 0.9em -0.9em 0 0em rgba(255, 255, 255, 0.2), 1.25em 0em 0 0em rgba(255, 255, 255, 0.2), 0.875em 0.875em 0 0em rgba(255, 255, 255, 0.5), 0em 1.25em 0 0em rgba(255, 255, 255, 0.7), -0.9em 0.9em 0 0em #ffffff, -1.3em 0em 0 0em rgba(255, 255, 255, 0.2), -0.9em -0.9em 0 0em rgba(255, 255, 255, 0.2);
  }
  75% {
    box-shadow: 0em -1.3em 0em 0em rgba(255, 255, 255, 0.2), 0.9em -0.9em 0 0em rgba(255, 255, 255, 0.2), 1.25em 0em 0 0em rgba(255, 255, 255, 0.2), 0.875em 0.875em 0 0em rgba(255, 255, 255, 0.2), 0em 1.25em 0 0em rgba(255, 255, 255, 0.5), -0.9em 0.9em 0 0em rgba(255, 255, 255, 0.7), -1.3em 0em 0 0em #ffffff, -0.9em -0.9em 0 0em rgba(255, 255, 255, 0.2);
  }
  87.5% {
    box-shadow: 0em -1.3em 0em 0em rgba(255, 255, 255, 0.2), 0.9em -0.9em 0 0em rgba(255, 255, 255, 0.2), 1.25em 0em 0 0em rgba(255, 255, 255, 0.2), 0.875em 0.875em 0 0em rgba(255, 255, 255, 0.2), 0em 1.25em 0 0em rgba(255, 255, 255, 0.2), -0.9em 0.9em 0 0em rgba(255, 255, 255, 0.5), -1.3em 0em 0 0em rgba(255, 255, 255, 0.7), -0.9em -0.9em 0 0em #ffffff;
  }
}

@keyframes weex-spinner {
  0%,
  100% {
    box-shadow: 0em -1.3em 0em 0em #ffffff, 0.9em -0.9em 0 0em rgba(255, 255, 255, 0.2), 1.25em 0em 0 0em rgba(255, 255, 255, 0.2), 0.875em 0.875em 0 0em rgba(255, 255, 255, 0.2), 0em 1.25em 0 0em rgba(255, 255, 255, 0.2), -0.9em 0.9em 0 0em rgba(255, 255, 255, 0.2), -1.3em 0em 0 0em rgba(255, 255, 255, 0.5), -0.9em -0.9em 0 0em rgba(255, 255, 255, 0.7);
  }
  11.25% {
    box-shadow: 0em -1.3em 0em 0em rgba(255, 255, 255, 0.7), 0.9em -0.9em 0 0em #ffffff, 1.25em 0em 0 0em rgba(255, 255, 255, 0.2), 0.875em 0.875em 0 0em rgba(255, 255, 255, 0.2), 0em 1.25em 0 0em rgba(255, 255, 255, 0.2), -0.9em 0.9em 0 0em rgba(255, 255, 255, 0.2), -1.3em 0em 0 0em rgba(255, 255, 255, 0.2), -0.9em -0.9em 0 0em rgba(255, 255, 255, 0.5);
  }
  25% {
    box-shadow: 0em -1.3em 0em 0em rgba(255, 255, 255, 0.5), 0.9em -0.9em 0 0em rgba(255, 255, 255, 0.7), 1.25em 0em 0 0em #ffffff, 0.875em 0.875em 0 0em rgba(255, 255, 255, 0.2), 0em 1.25em 0 0em rgba(255, 255, 255, 0.2), -0.9em 0.9em 0 0em rgba(255, 255, 255, 0.2), -1.3em 0em 0 0em rgba(255, 255, 255, 0.2), -0.9em -0.9em 0 0em rgba(255, 255, 255, 0.2);
  }
  37.5% {
    box-shadow: 0em -1.3em 0em 0em rgba(255, 255, 255, 0.2), 0.9em -0.9em 0 0em rgba(255, 255, 255, 0.5), 1.25em 0em 0 0em rgba(255, 255, 255, 0.7), 0.875em 0.875em 0 0em #ffffff, 0em 1.25em 0 0em rgba(255, 255, 255, 0.2), -0.9em 0.9em 0 0em rgba(255, 255, 255, 0.2), -1.3em 0em 0 0em rgba(255, 255, 255, 0.2), -0.9em -0.9em 0 0em rgba(255, 255, 255, 0.2);
  }
  50% {
    box-shadow: 0em -1.3em 0em 0em rgba(255, 255, 255, 0.2), 0.9em -0.9em 0 0em rgba(255, 255, 255, 0.2), 1.25em 0em 0 0em rgba(255, 255, 255, 0.5), 0.875em 0.875em 0 0em rgba(255, 255, 255, 0.7), 0em 1.25em 0 0em #ffffff, -0.9em 0.9em 0 0em rgba(255, 255, 255, 0.2), -1.3em 0em 0 0em rgba(255, 255, 255, 0.2), -0.9em -0.9em 0 0em rgba(255, 255, 255, 0.2);
  }
  61.25% {
    box-shadow: 0em -1.3em 0em 0em rgba(255, 255, 255, 0.2), 0.9em -0.9em 0 0em rgba(255, 255, 255, 0.2), 1.25em 0em 0 0em rgba(255, 255, 255, 0.2), 0.875em 0.875em 0 0em rgba(255, 255, 255, 0.5), 0em 1.25em 0 0em rgba(255, 255, 255, 0.7), -0.9em 0.9em 0 0em #ffffff, -1.3em 0em 0 0em rgba(255, 255, 255, 0.2), -0.9em -0.9em 0 0em rgba(255, 255, 255, 0.2);
  }
  75% {
    box-shadow: 0em -1.3em 0em 0em rgba(255, 255, 255, 0.2), 0.9em -0.9em 0 0em rgba(255, 255, 255, 0.2), 1.25em 0em 0 0em rgba(255, 255, 255, 0.2), 0.875em 0.875em 0 0em rgba(255, 255, 255, 0.2), 0em 1.25em 0 0em rgba(255, 255, 255, 0.5), -0.9em 0.9em 0 0em rgba(255, 255, 255, 0.7), -1.3em 0em 0 0em #ffffff, -0.9em -0.9em 0 0em rgba(255, 255, 255, 0.2);
  }
  87.5% {
    box-shadow: 0em -1.3em 0em 0em rgba(255, 255, 255, 0.2), 0.9em -0.9em 0 0em rgba(255, 255, 255, 0.2), 1.25em 0em 0 0em rgba(255, 255, 255, 0.2), 0.875em 0.875em 0 0em rgba(255, 255, 255, 0.2), 0em 1.25em 0 0em rgba(255, 255, 255, 0.2), -0.9em 0.9em 0 0em rgba(255, 255, 255, 0.5), -1.3em 0em 0 0em rgba(255, 255, 255, 0.7), -0.9em -0.9em 0 0em #ffffff;
  }
}
`

function getStyleSheet (spinnerVm) {
  if (spinnerVm._styleSheet) {
    return
  }
  spinnerVm._styleSheet = getStyleSheetById('weex-cmp-loading-indicator')
}

function setKeyframeColor (spinnerVm, val) {
  getStyleSheet(spinnerVm)
  const keyframeRules = computeKeyFrameRules(val)
  const rules = spinnerVm._styleSheet.rules || spinnerVm._styleSheet.cssRules
  for (let i = 0, l = rules.length; i < l; i++) {
    const item = rules.item(i)
    if ((item.type === CSSRule.KEYFRAMES_RULE
          || item.type === CSSRule.WEBKIT_KEYFRAMES_RULE)
        && item.name === 'weex-spinner') {
      const cssRules = item.cssRules
      for (let j = 0, m = cssRules.length; j < m; j++) {
        const keyframe = cssRules[j]
        if (keyframe.type === CSSRule.KEYFRAME_RULE
          || keyframe.type === CSSRule.WEBKIT_KEYFRAME_RULE) {
          keyframe.style.boxShadow = keyframeRules[j]
        }
      }
    }
  }
}

function computeKeyFrameRules (rgb) {
  if (!rgb) {
    return
  }
  const scaleArr = [
    '0em -1.3em 0em 0em',
    '0.9em -0.9em 0 0em',
    '1.25em 0em 0 0em',
    '0.875em 0.875em 0 0em',
    '0em 1.25em 0 0em',
    '-0.9em 0.9em 0 0em',
    '-1.3em 0em 0 0em',
    '-0.9em -0.9em 0 0em']
  const colorArr = [
    '1',
    '0.2',
    '0.2',
    '0.2',
    '0.2',
    '0.2',
    '0.5',
    '0.7'].map(function (e) {
      return 'rgba(' + rgb.r + ',' + rgb.g + ',' + rgb.b + ',' + e + ')'
    })
  const rules = []
  for (let i = 0; i < scaleArr.length; i++) {
    const tmpColorArr = loopArray(colorArr, i, 'r')
    rules.push(scaleArr.map(function (scaleStr, i) {
      return scaleStr + ' ' + tmpColorArr[i]
    }).join(', '))
  }
  return rules
}

function processStyle (vm) {
  const style = extractComponentStyle(vm)
  const color = style.color
  const rgb = color && getRgb(color)
  if (rgb) {
    setKeyframeColor(vm, rgb)
  }
  return style
}

const loadingIndicator = {
  name: 'weex-loading-indicator',
  render (createElement) {
    this.weexType = 'loading-indicator'
    return createElement('mark', {
      attrs: { 'weex-type': 'loading-indicator' },
      staticClass: 'weex-loading-indicator weex-ct',
      staticStyle: processStyle(this)
    })
  },
  _css
}

export default {
  init (weex) {
    extractComponentStyle = weex.extractComponentStyle
    getRgb = weex.utils.getRgb
    loopArray = weex.utils.loopArray
    getStyleSheetById = weex.utils.getStyleSheetById
    weex.registerComponent('loading-indicator', loadingIndicator)
  }
}